LTC4267 - Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator

The current mode switching regulator is designed for driving a 6V rated N-channel MOSFET and features programmable slope compensation, soft-start, and constant frequency operation, minimizing noise even with light loads. The LTC4267 includes an onboard error amplifier and voltage reference allowing use in both isolated and nonisolated configurations.

The LTC4267 is available in space saving, low profile 16-pin SSOP or DFN packages.

  • Complete Power Interface Port for IEEE 802.3af Powered Device (PD)
  • Onboard 100V, 400mA UVLO Switch
  • Precision Dual Level Inrush Current Limit
  • Integrated Current Mode Switching Regulator
  • Onboard 25kΩ Signature Resistor with Disable
  • Programmable Classification Current (Class 0-4)
  • Thermal Overload Protection
  • Power Good Signal
  • Integrated Error Amplifier and Voltage Reference
  • Low Profile 16-Pin SSOP and 3mm × 5mm DFN Packages
Typical Application
  • IP Phone Power Management
  • Wireless Access Points
  • Security Cameras
  • Power over Ethernet

Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC4267CDHC#PBF5x3 DFN-16C$2.92$2.20
LTC4267CDHC#TRPBF5x3 DFN-16C$2.30
LTC4267IDHC#PBF5x3 DFN-16I$3.50$2.65
LTC4267IDHC#TRPBF5x3 DFN-16I$2.75
Demo Boards
Part NumberDescriptionPrice
DC1145BLTC4267CDHC | PoE Powered Device w/12V Isolated Auxiliary, Vout = 12V @ 0.9A$75.00
DC804B-ALTC4267CDHC | RJ-45 Ethernet Output, Vout = 3.3V @ 1.0A$75.00
DC859ALTC4267IDHC Triple-Output PD for PoE$75.00
DC917ALTC4267| PoE to 3.3V@2.6A Isolated$75.00
Design Note
Reliability Data
Product Selector Card
LT Journal
Press Release
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